Smith



UNITED STATES PATENT @FFIC WATCH-CHAIN SWIVEL.

Specification of Letters Patent No.

To al? whom 'it may concern:

Be it known that I, SAMUEL Y. D. ArmowsMrrH, of the city of New York andState of New York, have invented a new and Improved Means ofConstructing a Natch- Chain Swivel; and I do hereby declare that thefollowing is a full and eXact description thereof, reference being hadto the accompanying drawings and to the letters of reference markedthereon.

The nature of my invention consists in the construction of a swivel withthe rotating parts concealed, and with but one spring to operate on bothends, which spring passes through the entire center of the shaft, and iseected in the following manner.

I make a cylindrical hole through the center of the piece a, a, a,Figure 2, for the introduction of a spiral spring ZJ, Fig. 4C whichspring operates on either end; and, on the back part of the knuckles o,b, of the splints c, c, Figs. l, 2, and by its compression and reactioncloses the openings of the splints as shown at cl, d, Fig.`2.

The upper part of Fig. 2 is removed, to show the manner which the centeris 8,715, dated February 10, 1852.

counter-sunk Afor the reception and formation of the swivel; g, is agroove cut concentric, and around its axis, for the reception of the endof a small screw 7L, which screw holds the same in position, andperfects the swivel as seen in Fig. 1, thus forming a hook whichcombines within itself all the facilities for attachment and detachment;together with the revolving or swivel motion, giving it at the same timeall the security and convenience its uses can demand.

What I claim as my invention, and desire to secure by Letters Patentisl. The making swivels with a central spring to operate at bot-h itsends against the knuckles of the joints, and for closing the openings,substantially as described.

2. In combination with the swivel so made, I claim the swivel joint madesubstantially as described.

SAMUEL Y. D. ARRO'WSMITH.

Witnesses:

JAMES B. GOLDEY, A. C. VVILLMARTH.

